About

FitMath Lab exists for one reason: to give you your fitness numbers in seconds, with zero friction.

What we do

We publish free calculators for the questions lifters, runners, and everyday dieters actually ask: How many calories do I need? How much protein? What’s my body fat? What pace should I run? Each tool is built on a published formula, documented right on the page.

How we make money

FitMath Lab is reader-supported. You’ll see display ads and clearly-labeled affiliate links to products we’d recommend anyway (think whey protein and creatine monohydrate — not miracle pills). If you buy through a link, we may earn a commission at no extra cost to you. It keeps every calculator free.

Accuracy & honesty

Our calculators are estimates for informational purposes, not medical advice. Human bodies vary; formulas get you close, and your own tracked results get you the rest of the way. When the science updates, so do we.